Dont Hurt Me said:
Some kind of mistake, sorry about the double post. Look Macs are now 99.999% Pc parts. Thats the facts. Apple makes nice cases and a great OS but they are PCs now. Fancy cases but its the OS. Apple has turned into a great software company, just market last years OSX edition for pc users to buy. $119

yeah baby yeah!
Macs have always been PC parts... this isn't new.
Hard Drives, Ports, Optical... even down to the capacitor level. It is the same silicon just made custom for Apple.
And they have always been Personal Computers.
Apple is not going to want to support those not running a Mac that decide they want to run OS X. Nor should they. Just as they don't support running Windows on your Mac through BootCamp.
Another reason is that OS X is compiled for Intel x86 arch. They would have to recompile for AMD and other CPU makers as well.
While the code may run on an AMD it will not run efficiently. Not to mention all motherboard manufactuers they would have to rally support from, or write the drivers themselves.
Keeping OS X closed to Mac hardware is how it should stay. There is too much work involved in trying to support everyone. And would all that work pay off? Probably not. People are afraid to change, leaving Windows is not something most would do. And most wouldn't even pay for it, they would pirate it. Simply because they can't justify paying for something they won't use and just want to experiment with.
Also, you are right. It is the OS. But not independently. How the OS interacts with the hardware (backlit keyboard and display ambient adjustments etc.).
A Mac is an experience, an experience that is felt when the OS and the hardware function in harmony. I don't think OS X for me would feel the same if it was on a Dell or some bargain basement scrap box thrown together with parts from Newegg.